Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0f6ee8d475d364…

MALICIOUS

PDF

66.5 KB Created: 2020-12-16 23:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0f0478e4b00ed4f70aa672305871afd3 SHA-1: 997b9e49fd2025e593fab9eb6e645d12a15430f2 SHA-256: 4c0f6ee8d475d36498ce4af9d319ae00b6844d61e5d04a5f4886fc2f2e22c705
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/123?utm_term=gramercy+park+dental+reviews PDF link annotation
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/jadixobewu_fezororos.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/jusajutezij_sebovofebiw_xosol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_5fd8bab5c9267.pdfIn PDF document text
    • https://duzigavejad.weebly.com/uploads/1/3/4/5/134513143/145fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fbf440222811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f8cca82b552c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6360928a9c.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/f6ad2781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9cb44aa8db7.pdfIn PDF document text
    • https://fofevupug.weebly.com/uploads/1/3/4/4/134490210/4309226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0dd4b8-75e7-493c-ad4b-d8dbbd26140a/82541144553.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/rasizevedixofideturenadi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 5568 bytes
SHA-256: 9cdf73102e221a03b087482105dd89f68d5a7aee6e28b7bd2583ee72416754da
font_01_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 10604 bytes
SHA-256: 4aab23207157a47971be4f92771b6df57835b5a4356e4bb49299896983bc42a0

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